<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<script>
    var sum = 0;
    var avg = 0;
    for (var i = 0;i <= 100;i++){
        sum +=i;
    }
    avg = sum / 100;
    alert(avg);
</script>
<body>

</body>
</html>